| |
CX2SA > SATDIG 10.01.10 22:04l 601 Lines 18830 Bytes #999 (0) @ WW
BID : AMSATBB519
Read: GUEST
Subj: AMSAT-BB-digest V5 19
Path: IZ3LSV<IK2XDE<DB0RES<ON0AR<ZL2BAU<CX2SA
Sent: 100110/2003Z @:CX2SA.LAV.URY.SA #:31801 [Minas] FBB7.00e $:AMSATBB519
From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Azimuth question (Edward Cole)
2. Re: Azimuth question (Art McBride)
3. Re: Azimuth question (Dave Guimont)
4. January SatMag - G3YJO (Trevor .)
5. RES: AO-7 QSO between PS8RF and ZS2BK (PY5LF)
6. Re: Azimuth question (Luc Leblanc)
7. SO-67 (Luc Leblanc)
8. AO-51 returned to normal attitude (Andrew Glasbrenner)
9. Re: Winter Project (John B. Stephensen)
10. Re: AO-51 returned to normal attitude (Greg D.)
11. Europe AO-7 (Bob- W7LRD)
----------------------------------------------------------------------
Message: 1
Date: Sat, 09 Jan 2010 18:02:16 -0900
From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: Azimuth question
To: Dave Guimont <dguimon1@xxx.xx.xxx>, <kc6uqh@xxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <201001100302.o0A32NFl082756@xxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"; format=flowed
At 04:11 PM 1/9/2010, Dave Guimont wrote:
> >Dave,
> >A fraction of a degree per year, and at least once in the history of the
> >Earth the North and South magnetic poles reversed.
>
> >Art
> >
>
>Yes, I'm aware of that, it also rotates about 1? about true north,
>the earth wobbles a bit to change the AZ, but how
>many ham antennas in the world need that accuracy?
>
>And I doubt that the average ham can orient within more than 2? by eyeball!
>
>
>
>
>
> 73, Dave, WB6LLO
> dguimon1@xxx.xx.xxx
>
> Disagree: I learn....
>
> Pulling for P3E...
>
>
>_______________________________________________
>Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
For 144 & 432 that is probably adequate. On 2400
the beamwidth of my 33-inch dish is 10.6 deg.
(24.9 dBi) so keeping a signal within 1dB,
probably requires 3 deg beamwidth and knowing
true north with an accuracy of 10% of that results in 0.3 deg accuracy.
Of course if you are doing something like eme on
1296 with a 16-foot dish the beamwidth is 3.38
deg. (34.9 dBi). For eme it is desirable to
track within 1db of maximum gain which may is
something like 1-deg. and 10% accuracy is 0.1
deg. How would you set up a dish azimuth so that
it is that accurate to true north? For eme it
usually requires comparison with tracking sw for
location of the Sun or Moon. At these freq. and
dish sizes one can detect solar and lunar noise
to peak onto, then adjust az and el calib. to match tracking sw az and el.
As it turns out my dish digital az-el readout has
0.1 deg. resolution so that is best I can
read. On the Yaesu B5400, one is lucky to
determine direction within 7.5 deg. for azimuth
and 3.75 deg. for elevation. Manually tracking
AO-40 with the B5400 was very touchy, as fine
adjustment is near impossible. But I did refine
my azimuth positioning using solar noise on 2400.
For 144 or 432 probably the most accurate method
for calib of azimuth is using a repeater many
miles away (knowing both its Lat-Lon and your
Lat-Lon with bearing sw that produces a great-circle bearing).
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
500-KHz/CW, 144-MHz EME, 1296-MHz EME
DUBUS Magazine USA Rep dubususa@xxxxxxx.xxx
======================================
------------------------------
Message: 2
Date: Sat, 9 Jan 2010 19:14:45 -0800
From: "Art McBride" <kc6uqh@xxx.xxx>
Subject: [amsat-bb] Re: Azimuth question
To: "'Edward Cole'" <kl7uw@xxxxxxxxx.xxx>, "'Dave Guimont'"
<dguimon1@xxx.xx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <E488DB38F1E5438B9C1A14A868D90CE9@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Dave,
If you are technically correct or give a rough answer you get nit picked
form on side or the other. Near by magnetic objects can cause serious errors
using the Sun or Moon for alignment solves all problems for both azimuth and
elevation. For near DC 70cm and longer wavelengths a pointing error of less
than 10 degrees is insignificant. 13cm and shorter accuracy becomes more
important.
Art
-----Original Message-----
From: Edward Cole [mailto:kl7uw@xxxxxxxxx.xxxx
Sent: Saturday, January 09, 2010 7:02 PM
To: Dave Guimont; kc6uqh@xxx.xxx
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Re: Azimuth question
At 04:11 PM 1/9/2010, Dave Guimont wrote:
> >Dave,
> >A fraction of a degree per year, and at least once in the history of the
> >Earth the North and South magnetic poles reversed.
>
> >Art
> >
>
>Yes, I'm aware of that, it also rotates about 1? about true north,
>the earth wobbles a bit to change the AZ, but how
>many ham antennas in the world need that accuracy?
>
>And I doubt that the average ham can orient within more than 2? by eyeball!
>
>
>
>
>
> 73, Dave, WB6LLO
> dguimon1@xxx.xx.xxx
>
> Disagree: I learn....
>
> Pulling for P3E...
>
>
>_______________________________________________
>Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
For 144 & 432 that is probably adequate. On 2400
the beamwidth of my 33-inch dish is 10.6 deg.
(24.9 dBi) so keeping a signal within 1dB,
probably requires 3 deg beamwidth and knowing
true north with an accuracy of 10% of that results in 0.3 deg accuracy.
Of course if you are doing something like eme on
1296 with a 16-foot dish the beamwidth is 3.38
deg. (34.9 dBi). For eme it is desirable to
track within 1db of maximum gain which may is
something like 1-deg. and 10% accuracy is 0.1
deg. How would you set up a dish azimuth so that
it is that accurate to true north? For eme it
usually requires comparison with tracking sw for
location of the Sun or Moon. At these freq. and
dish sizes one can detect solar and lunar noise
to peak onto, then adjust az and el calib. to match tracking sw az and el.
As it turns out my dish digital az-el readout has
0.1 deg. resolution so that is best I can
read. On the Yaesu B5400, one is lucky to
determine direction within 7.5 deg. for azimuth
and 3.75 deg. for elevation. Manually tracking
AO-40 with the B5400 was very touchy, as fine
adjustment is near impossible. But I did refine
my azimuth positioning using solar noise on 2400.
For 144 or 432 probably the most accurate method
for calib of azimuth is using a repeater many
miles away (knowing both its Lat-Lon and your
Lat-Lon with bearing sw that produces a great-circle bearing).
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
500-KHz/CW, 144-MHz EME, 1296-MHz EME
DUBUS Magazine USA Rep dubususa@xxxxxxx.xxx
======================================
__________ Information from ESET NOD32 Antivirus, version of virus signature
database 4757 (20100109) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
__________ Information from ESET NOD32 Antivirus, version of virus signature
database 4757 (20100109) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
------------------------------
Message: 3
Date: Sat, 09 Jan 2010 22:16:38 -0800
From: Dave Guimont <dguimon1@xxx.xx.xxx>
Subject: [amsat-bb] Re: Azimuth question
To: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <25.9F.19471.7C0794B4@xxxxxxxxxxxxx.xxxx.xx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
>
>For 144 & 432 that is probably adequate. On 2400 the beamwidth of
>my 33-inch dish is 10.6 deg. (24.9 dBi) so keeping a signal within
>1dB, probably requires 3 deg beamwidth and knowing true north with
>an accuracy of 10% of that results in 0.3 deg accuracy.
>
>Of course if you are doing something like eme on 1296 with a 16-foot
>dish the beamwidth is 3.38 deg. (34.9 dBi). For eme it is desirable
>to track within 1db of maximum gain which may is something like
>1-deg. and 10% accuracy is 0.1 deg. How would you set up a dish
>azimuth so that it is that accurate to true north? For eme it
>usually requires comparison with tracking sw for location of the Sun
>or Moon. At these freq. and dish sizes one can detect solar and
>lunar noise to peak onto, then adjust az and el calib. to match
>tracking sw az and el.
Yes, I used sun noise to align my 36" dish at 2.4 gigs, it was
certainly adequate for ham work...
I've been tempted to try EME, and may yet do so....
Looks as tho any HEO is a way off, if ever...
But still counting on ESA and Peter to make it so...
73, Dave, WB6LLO
dguimon1@xxx.xx.xxx
Disagree: I learn....
Pulling for P3E...
------------------------------
Message: 4
Date: Sun, 10 Jan 2010 10:50:47 +0000 (GMT)
From: "Trevor ." <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] January SatMag - G3YJO
To: amsat-bb@xxxxx.xxx
Message-ID: <645711.74528.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
The January edition of SatMag is now available and pages 37-42 have an
interview with Martin Sweeting G3YJO of SSTL.
Download January 2010 SatMag from
http://www.satmagazine.com/2010/SatMag_Jan10.pdf
73 Trevor M5AKA
Daily Amateur Radio news (Email/RSS): http://www.southgatearc.org/
Email Your News to: editot at southgatearc.org
Or Upload Your News at: http://www.southgatearc.org/news/your_news_1.htm
----
------------------------------
Message: 5
Date: Sun, 10 Jan 2010 14:05:49 -0200
From: "PY5LF" <py5lf@xxxxxxxxxxxxx.xxx.xx>
Subject: [amsat-bb] RES: AO-7 QSO between PS8RF and ZS2BK
To: "'Pierre van Deventer'" <pierrevd@xxxx.xx.xx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <001401ca920e$c79c7f00$56d57d00$@xxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Congratulations to Andre and Piraja for the new world record!
Well done guys .
73
PY5LF
LUCIANO FABRICIO
CURITIBA-PR-BRAZIL
GG54JM?
http://www.qrz.com/db/py5lf
www.falautomation.com.br
-----Mensagem original-----
De: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx Em nome
de Pierre van Deventer
Enviada em: s?bado, 9 de janeiro de 2010 09:06
Para: AMSAT-BB@xxxxx.xxx
Assunto: [amsat-bb] AO-7 QSO between PS8RF and ZS2BK
Congratulations to Piraja PS8RF and Andre ZS2BK for their world record
breaking two way SSB QSO over 7,694 km.
This is a mere 203 km short of the theoretical maximum of 7,907 km ??
Very well done on this great achievement !!
73, Pierre ZS6BB
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Sun, 10 Jan 2010 04:43:08 -0500
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] Re: Azimuth question
To: amsat-bb@xxxxx.xxx
Message-ID: <4B495ADC.25614.3F3DC31@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=US-ASCII
On 9 Jan 2010 at 19:09, Randy wrote:
Date sent: Sat, 09 Jan 2010 19:09:35 -0500
From: Randy <RSwart1@xxxxx.xx.xxx>
Subject: [amsat-bb] Re: Azimuth question
To: 'Pete Rowe' <ptrowe@xxxxx.xxx>, amsat-bb@xxxxx.xxxx
'Ken Ernandes' <n2wwd@xxxxxxxxxx.xxx>
Send reply to: RSwart1@xxxxx.xx.xxx
> Thanks everyone for the help ..
> I'm all sighted in on the North Star ..
> Actually, I went to wikipedia and read up on magnetic declination.
> It says that if you are east of the 0 degree line ( which I am in New York )
> Then true north is east of magnetic north by that number of degrees as
> Shown on the declination map .. I'll listen to VO-52 and see how that goes.
>
> Randy - N2CUA
>
Hi Randy
The north pointing was also an issue here. I try the north start, the sun
shadow on my tower at noon, GPS, magnetic compass corrected for
the true north but i was still off.
When my rotor control box lost his north setting i decided from an
approximate north pointing to fine tune it while pointing on a
satellite. I try first with AO-51. It take's me a couple of pass to be able
to set my north alignment using this method. You will have to
move you antenna back and forth writing the calculated azimuth and your
maximum signal direction. When you get an whole list you just have
to make the average of the differences and you just have to correct your
north pointing with this difference. I was at an 19 degrees error
and when i reset my control box to the north taking in account this
corrected factor all the other satellite pointing became right on the
spot.
The dramatic effect come at AOS and LOS when prior to this adjustment i was
nearly unable to work anything below 5 degrees of elevation but
after i often hear my downlink near 1 degrees and sometimes at half a degree.
It was easy here to readjust my north setting as my Alpha Spid rotor can be
adjusted to the north without having to mechanically move the
mast on the rotor probably not the best season to make this king of setting
actually here.
I wrote "here" as i'm happy that some in Florida can actually feel what we
can feel here when playing with the antennas and rotor outside
in winter... Even in Europe they also have this great opportunity to make
this new exciting experiment...
P.S. To our Canadian snow birds there is no need to go to Florida to get sub
freezing point temperature you just have them just out of your
home door here...but let say you will answer me back that you prefer minus
4C instead of my actual minus 20C...
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 7
Date: Sun, 10 Jan 2010 08:21:03 -0500
From: Luc Leblanc <lucleblanc6@xxxxxxxxx.xx>
Subject: [amsat-bb] SO-67
To: amsat-bb@xxxxx.xxx
Message-ID: <4B498DEF.21086.14B777@xxxxxxxxxxx.xxxxxxxxx.xx>
Content-Type: text/plain; charset=US-ASCII
SO-67 was not on at the schedule 1300Z pass over NA
"-"
Luc Leblanc VE2DWE
Skype VE2DWE
www.qsl.net/ve2dwe
DSTAR urcall VE2DWE
WAC BASIC CW PHONE SATELLITE
------------------------------
Message: 8
Date: Sun, 10 Jan 2010 12:03:02 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
Subject: [amsat-bb] AO-51 returned to normal attitude
To: Amsat-BB <amsat-bb@xxxxx.xxx>, AO51 Modes <ao51-modes@xxxxx.xxx>
Message-ID: <4B4A0846.8030206@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Last night we repolarized the magnet on AO-51 to again favor the
northern hemisphere. There may be some rapid fading as the nutation
dampers do their job over the next few weeks. The command team
appreciates all the reports and observations during this experiment.
73, Drew KO4MA
AMSAT-NA VP Operations
------------------------------
Message: 9
Date: Sun, 10 Jan 2010 17:33:48 -0000
From: "John B. Stephensen" <kd6ozh@xxxxxxx.xxx>
Subject: [amsat-bb] Re: Winter Project
To: <danoman@xxxxx.xxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <5DFEBB27777646EE86EB94001EFEAACA@xxxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Try the ARRL Periodicals Archive search. There were a lot of construction
articles published in the 1950's and 1960's that can be downloaded at no
charge. RF Parts and Surplus Sales of Nebraska stock parts.
Remember to keep one hand in your pocket when troubleshooting. If you give
the high voltage a path to ground through your heart, you're dead.
73,
John
KD6OZH
>> ----- Original Message -----
>> From: "Douglas Anoman" <danoman@xxxxx.xxxxxxxx.xxx>
>> To: amsat-bb@xxxxx.xxx
>> Sent: Thursday, January 7, 2010 7:56:29 AM GMT -08:00 US/Canada Pacific
>> Subject: [amsat-bb] Winter Project
>>
>>
>> I'm looking for a winter project can any one point me in the direction of
>> a 2 meter tube amp nothing crazy about 25-50 out, 1-10 in. I have never
>> used or played with a tube circuit so i thougt winter why not. Thanks 73
>>
>> Thank You
>> Douglas Anoman
>> KC9MLN
>> KC9MLN@xxxxx.xxx
>> Amsat #37043
------------------------------
Message: 10
Date: Sun, 10 Jan 2010 10:44:49 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: AO-51 returned to normal attitude
To: <glasbrenner@xxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>,
<ao51-modes@xxxxx.xxx>
Message-ID: <BLU133-W22C56F018F98797775B288A96E0@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Drew,
Did the flipping activity have a net (lasting) effect on the satellite's
spin rate? I recall a discussion on how slow the bird was spinning,
implying that we'd like it to go a bit faster (is that true?). Since we're
putting energy into the satellite's orientation via the magnet, I'd expect
the energy should partly wind up as heat in the dampers. Wouldn't the rest
go into spin?
Just curious,
Greg KO6TH
> Date: Sun, 10 Jan 2010 12:03:02 -0500
> From: glasbrenner@xxxxxxxxxx.xxx
> To: amsat-bb@xxxxx.xxxx ao51-modes@xxxxx.xxx
> Subject: [amsat-bb] AO-51 returned to normal attitude
>
> Last night we repolarized the magnet on AO-51 to again favor the
> northern hemisphere. There may be some rapid fading as the nutation
> dampers do their job over the next few weeks. The command team
> appreciates all the reports and observations during this experiment.
>
> 73, Drew KO4MA
> AMSAT-NA VP Operations
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_________________________________________________________________
Hotmail: Trusted email with powerful SPAM protection.
http://clk.atdmt.com/GBL/go/196390707/direct/01/
------------------------------
Message: 11
Date: Sun, 10 Jan 2010 19:26:55 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
Subject: [amsat-bb] Europe AO-7
To: amsat-bb@xxxxx.xxx
Message-ID:
<936541754.9398631263151615032.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxxxx
x.xxx>
Content-Type: text/plain; charset=utf-8
Hello
At 2013Z I will will have a short footprint into Northern Europe from
CN87wk.? Downlink about 145.950 +/-.
73 Bob W7LRD
Seattle, Wa.
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 5, Issue 19
***************************************
Read previous mail | Read next mail
| |
